Alarm.



UNITED STATES CLARENCE H. BRYAN, OF CHICAGO, ILLINOIS.

ALARM.

SPECIFICATION forming part of Letters Patent N o. 670,702. dated March 26, 1901.

Application iiled December l0, 1900. Serial No. $9,275. (No model.)

To all whom 7275 may concern.-

Be it known that I, CLARENCE H. BRYAN, a citizen of the Unwited States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Alarms, of which the following is a specification.

Myinvention relates to a cheap, simple, and convenient device for giving the alarm when a burglar is attempting to enter a house, or it may be used as an alarm for any other purpose or as a door-bell. It is illustrated in the accompanying drawings, wherein- Figure l is an elevation showing one :form of my invention as applied to a door-knob. Fig. 2 is a side elevation of a different form of the device with the knob removed. Fig. 3 is a detail of a modification of the bell-Wire.

Like parts are indicated by the same letter in all the figures.

A is the door; B, the exterior knob; C, the interior knob; D, the spindle; E, the keyhole; F, the key therein; G, a wire or rod or spring. It may be straight, as shown, or it may be spiral, as shown in G', Fig. 3, at one end of which is the alarm device (in this case a bell H) and at the other end a bent portion J, which surrounds the spindle. This bent portion is continued downwardly parallel with the wire G and is then bent into a horizontal loop K, which keeps the rod or wire G at a proper distance awayfrom the door, so as to free the key and at the same time keep the alarm device or bell away from interference with the door. The end K overhangs or hooks onto the wire G, so that the device is firmly gripped upon the door-knob spindle.

In the modied form the rod or wire G is extended in the form of a spring L, so that when once the bell has been disturbedit continues giving its alarm for a considerable period.

Many modifications could be made in the device without-departing from the spirit of my invention. It might be attached to the inner extremity of devices other than that shown, it only being necessary that the outer extension be such as would commonly beinterfered with by the burglar. Moreover, it might be attached to any device which, like the knob and spindle, is loosely secured in the door, for in that case, even though not directly touched by the burglar, it would nevertheless give the alarm if the door were interfered with or caused to shake or rattle. Again, the device may be attached in any manner to the projecting part. I do not therefore wish it to be limited to the particular form shown. It may be held under by the springing action of the rod or by the clamping action resulting from the end K overhanging the rod or wire, or it may be held by screws or otherwise.

I have shown my attachment removably secured to the spindle, as this is most convenient. The rod or wire is supposed to be made of spring metal, so that it will spring over the spindle, and thus the parts may be easily attached or disengaged. The loop K can be dispensed with, if desired, and this would be proper under some conditions. The alarm device itself might be other than a mechanical alarm; but I prefer a simple mechanical alarm which responds to any shaking or rattling of either the door or the knob.

The use and operation of my invention are of course evident.

The burglar if he undertakes to enter through the door or in any :manner interferes with the door will turn the knob or rattle the door sufficiently to set the alarm-bell vibratbe carried about conveniently. They can be' attached to hotel door-knobs, and thus the occupant of a separate room is given comparative security, as in such case frequently the only way to enter the room is through the door. Such a device can also be used to rouse the sleeper when applied in country hotels, where no other means for that purpose are employed.

As previously explained, my device may be used as a burglar-alarm, or it may be used as IOO a hotel call-bell, or it may be used as a private door-bell, and can be applied and taken off from time to time when and as required.

I claim- 1. In an alarm for doors, the combination of a bell W`ith a pendulum-like support therefor, means connected With said support Whereby it may be removably attached to the spindle of the door-knob, and means located between the knob and the bell and connected With said support and projecting laterally to engage the door so as to keep the bell out of Contact with the door, and the upper end of the support out of contact with the key.

2. In an alarm for doors, the combination of a bell with a pendulum-like support, provided with, first, a spring-clamping bend to ward the door as to keep the upper part of the' support out of engagement With the key, and the bell out of engagement with the door, and a spring part associated with the support to keep the bell ringing after it has once been started.

CLARENCE I-I. BRYAN.

Witnesses:

EDGAR L. CONANT, HOMER L. KRAFT. 

